Air and HVLP paint sprayers both require a connection to compressed air, such as an Air Compressor. These are best used for precise spraying and finishing. Airless sprayers are best used for quick and even spraying of larger areas.

This is best to consider in regards to your project and where you'll be using the sprayer. Handheld sprayers are more mobile, but usually still require connection to a larger unit. Carted sprayers are on a stand with wheels and can be rolled. Stationary sprayers are on a stand without wheels, but can still be picked up.